US11392091B2 - Watch pivot device - Google Patents
Watch pivot device Download PDFInfo
- Publication number
- US11392091B2 US11392091B2 US16/047,646 US201816047646A US11392091B2 US 11392091 B2 US11392091 B2 US 11392091B2 US 201816047646 A US201816047646 A US 201816047646A US 11392091 B2 US11392091 B2 US 11392091B2
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- United States
- Prior art keywords
- pivot
- lubricant
- watch
- bearing
- movement
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
- G04B31/08—Lubrication
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
- G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
- G04B31/008—Jewel bearings
- G04B31/0082—Jewel bearings with jewel hole and cap jewel
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B13/00—Gearwork
- G04B13/02—Wheels; Pinions; Spindles; Pivots
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
- G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
- G04B31/008—Jewel bearings
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
- G04B31/06—Manufacture or mounting processes
Definitions
- the invention relates to a watch pivot device.
- the invention also relates to a watch mechanism comprising a suchlike watch pivot device.
- the invention further relates to a watch movement comprising a suchlike watch pivot device or a suchlike mechanism.
- the invention likewise relates to a timepiece comprising a suchlike device or a suchlike mechanism or a suchlike movement.
- the invention finally relates to a method of assembly or realization of a suchlike pivot device, of a suchlike mechanism, of a suchlike movement or of a suchlike timepiece.
- a difference in the quality factor is reflected by a difference in amplitude for an oscillator of the balance wheel and hairspring type and may be reflected, more particularly, by a difference in the running of the movement, and consequently in the need for precision of the timepiece in order to minimize the difference in the quality factor between the horizontal positions and the vertical positions.
- the friction in the different positions varies because the configurations of the contact between the pivot and the pivot jewel change.
- a horizontal watch position the axis of the balance wheel is vertical and the tip of the pivot of the axis bears against a jewel known as the counter-pivot.
- this jewel is plane and the tip of the pivot is rounded, with the result that the resistive torque is low.
- a vertical watch position the axis of the balance wheel is in a horizontal position and rubs against the edge of a hole, in general an olive hole (with rounded edges) disposed in a jewel.
- the resistive torque is higher, and the amplitude of oscillation of the balance wheel is lower, than in the horizontal position.
- one solution involves increasing the friction in horizontal positions of the watch by making changes to the conventional balance wheel pivot device.
- a suchlike solution makes it possible to reduce the differences in friction between the horizontal and vertical positions.
- Document CH239786 discloses a pivot device combining an olive-hole jewel and an abutment (counter-pivot) inclined in relation to the axis. This makes it possible to induce permanent friction of the cylindrical part of the axis against the olive-hole jewel in horizontal positions, and accordingly to increase the frictional forces or the resistive torques in the horizontal positions.
- the aim of the invention is to make available a watch pivot device making it possible to address the aforementioned shortcomings and to improve the devices that are known from the prior art.
- the invention proposes a pivot device in which the difference in the quality factor between the “flat” and “suspended” positions is minimized.
- the invention also proposes a method for the implementation of a suchlike pivot device.
- the pivot device or the watch mechanism or the watch movement or the timepiece according to the invention is defined by point 6 below.
- the pivot device according to the invention is also defined by point 7 below.
- pivot device Different embodiments of the pivot device are defined by points 8 to 11 below.
- the watch mechanism according to the invention is defined by point 12 below.
- the watch movement according to the invention is defined by point 13 below.
- the timepiece according to the invention is defined by point 14 below.
- FIGS. 1 and 2 are schematic views of the embodiment of a timepiece, the timepiece being respectively in the “flat” position and in the “suspended” position.
- FIG. 3 is a graph depicting the changes in the quality factor of a timepiece, depending on its position, for different lubricants used in the pivot devices of oscillators.
- FIG. 4 is a graph depicting the differences between the average of the quality factors for positions CH and FH and the quality factor in the 6H position of the timepiece for the different lubricants, these differences being plotted in FIG. 3 .
- FIG. 5 is a graph depicting the changes in the quality factor of a timepiece, depending on its position, for different lubricants used in the pivot devices of oscillators.
- FIG. 6 is a graph depicting the differences between the average of the quality factors for the CH and FH positions and the quality factor in the 6H position of the timepiece for the different lubricants, these differences being plotted in FIG. 5 .
- FIG. 7 is a graph depicting the differences between the average of the quality factors for the CH and FH positions and the quality factor in the 6H position of the timepiece as a function of the viscosity of the lubricants used in the pivot devices of oscillators.
- FIG. 8 is a graph depicting the changes in the quality factor of a timepiece in the 6H position, as a function of the viscosity of the lubricants used in the pivot devices of oscillators.
- the timepiece is a watch, for example, more particularly a wristwatch.
- the timepiece comprises a mechanical watch movement 300 .
- the watch movement comprises a mechanism 200 , more particularly an oscillator 200 of the balance wheel and hairspring type.
- the mechanism or the oscillator comprises at least one, and more particularly two, pivot devices 100 . These pivot devices make it possible to pivot the balance 10 on a frame 20 of the mechanism or the movement about an axis A.
- the balance comprises a staff 11 , itself comprising at least one pivot 1 and more particularly two pivots, each being situated at one extremity of the staff.
- the mechanism 200 or the movement 300 comprises the frame 20 .
- the frame 20 is equipped with at least one bearing 2 intended to cooperate with a pivot or intended to receive a pivot.
- the frame preferably comprises two bearings 2 , each bearing cooperating with a pivot or receiving a pivot.
- a first bearing is mounted, for example, on a plate of the frame, and a second bearing is mounted, for example, on a bridge of the frame.
- the bearing 2 or each bearing advantageously comprises a pivot jewel 21 and a counter-pivot jewel 22 .
- the bearing or each bearing advantageously constitutes part of a shock absorber.
- the pivot comprises an end surface 101 , more particularly a curved or hemispherical surface 101 , and a lateral surface 102 , more particularly a cylindrical surface 102 .
- the pivot may be integrally formed with the balance staff 11 .
- the bearing 2 comprises a pivot jewel 21 having a surface 211 in the form of a flank of a circular hole, more particularly an olive surface, and a counter-pivot jewel 22 having a surface 221 , more particularly a plane surface.
- the surfaces 101 and 221 are intended to cooperate by contact in order to guide the oscillator as it pivots, more particularly into a “flat” position of the timepiece.
- the surfaces 102 and 211 are intended to cooperate by contact in order to guide the oscillator as it pivots, more particularly into a “suspended” position of the timepiece.
- the watch pivot device 100 comprises the pivot 1 and a bearing 2 .
- At least one surface of the pivot 101 , 102 and/or one surface of the bearing 211 , 221 is coated with a lubricant, of which the kinematic viscosity at a temperature of 20° C. is greater than or equal to 1.5 St.
- all the surfaces 101 , 102 , 211 and 221 involved in the guiding of the oscillator are coated with a lubricant, of which the kinematic viscosity at a temperature of 20° C. is greater than or equal to 1.5 St.
- the lubricant is preferably an oil or a grease.
- the lubricant may or may not be free from additives.
- the kinematic viscosity of the lubricant at a temperature of 20° C. is advantageously greater than or equal to 1.6 St or 1.7 St or 1.8 St or 1.9 St or 2 St or 2.2 St or 2.5 St or 3 St or 4 St or 5 St or 6 St or 7 St or 8 St or 9 St or 10 St or 11 St or 12 St or 14 St or 16 St or 18 St or 20 St or 25 St or 30 St or 35 St or 40 St.
- the kinematic viscosity of the lubricant at a temperature of 20° C. is advantageously lower than or equal to 50 St or 40 St or 35 St or 30 St or 25 St or 20 St or 18 St or 16 St or 14 St or 12 St or 11 St or 10 St or 9 St or 8 St or 7 St or 6 St or 5 St.
- the pivot is preferably a balance staff pivot of an oscillator of the balance wheel and hairspring type having a frequency of oscillation greater than or equal to 3 Hz, or greater than or equal to 4 Hz.
- the bearing advantageously comprises one or a plurality of jewels, more particularly one or a plurality of jewels made of ruby.
- the pivot is a pivot of an element, more particularly of the balance wheel, of which the mass is greater than 5 ⁇ 10 ⁇ 2 g or of which the moment of inertia is greater than 5 ⁇ 10 ⁇ 10 kg ⁇ m 2 .
- One embodiment of a method of assembly of a watch pivot device 100 as described previously, or of a mechanism 200 as described previously, or of a movement 300 as described previously, or of a timepiece 400 as described previously is disclosed below.
- the method comprises the following stages:
- the order of the last two stages does not matter.
- the lubricant may be applied before or after the positioning of the pivot in the bearing.
- the method may be implemented during a phase of production of a movement or a timepiece.
- the method may also be implemented during a maintenance phase of the movement or the timepiece, more particularly in the course of service or repair operations.
- the movement under consideration is a Rolex movement of type 3130 equipped with a 4 Hz oscillator, of which the balance wheel has an inertia of 14 ⁇ 10 ⁇ 10 kg ⁇ m 2 .
- the balance wheel has an inertia of 14 ⁇ 10 ⁇ 10 kg ⁇ m 2 .
- ten samples of a Rolex movement of type 3130 were the subject of measurements.
- the measurements are performed without an escapement by means of an automated device allowing values for the quality factor (FQ) of an oscillator to be obtained for a given range of oscillations and for a range of given positions of the movement.
- the movement thus scans through different watch positions, from the FH position (reference position at 0° of inclination, balance shaft vertical) to the CH position (rotation through 180°, balance shaft vertical) passing through the 6H position (rotation through 90°, balance shaft horizontal), by increments of 10°.
- a strict protocol for cleaning the pivot device of the oscillator is performed between the various lubrications in order to thoroughly clean the molecules of the previous lubricants and, in particular, the molecules of the additives, with the aim of measuring only the effect of the oil under consideration without being influenced by the others.
- the pivot device is immersed successively in different baths. The new lubricant is not applied until after this cleaning protocol.
- the five additive-free lubricants (apart from the reference lubricant) under consideration are synthetic-based oils of the PAO (Poly Alpha Olefin) type, which have different viscosities:
- the viscosity of the 9010 reference oil used has a viscosity of 1.2 St at 20° C.
- FIG. 3 depicts, for each of the lubricants, curves showing the change in the quality factor (FQ), for a reference amplitude of the oscillator at 280°, depending on the different positions (P) of the movement.
- This reference amplitude is considered as being representative of a movement when worn and representative of the effects of the lubricants on the pivot device of the oscillator.
- the values for the quality factor are averages obtained on the basis of the measurements performed on each of the samples of the movement of type 3130.
- oils 9010 and A give better values for the quality factor (respectively 327 and 334 in the FH and CH positions for oil 9010, and respectively 330 and 338 in the FH and CH positions for oil A).
- oil B (respectively 303 and 312 in the FH and CH positions), oil C (respectively 289 and 297 in the FH and CH positions), oil D (respectively 268 and 275 in the FH and CH positions), and finally oil E (respectively 220 and 224 in the FH and CH positions).
- oil B (respectively 303 and 312 in the FH and CH positions)
- oil C (respectively 289 and 297 in the FH and CH positions)
- oil D (respectively 268 and 275 in the FH and CH positions)
- oil E (respectively 220 and 224 in the FH and CH positions).
- oils 9010 and A give quality factor values which are respectively 253 and 256
- oil B gives a quality factor value of 249
- oil C gives a quality factor value of 243.
- the quality factor of the oscillator is less sensitive to the positions of the movement with lubricants B, C and D than with lubricants A and 9010, while still being sufficiently high, in the order of 230 to 320, to permit good chronometric and/or energetic performances of the oscillator.
- Oil C gives particularly good results with a flat hanging difference of the quality factor in the order of 50, and with quality factor values between 242 and 297.
- the frictional torque prevailing within the pivot device lubricated by oil C is sufficiently low to obtain satisfactory quality factors and varies sufficiently little to obtain homogeneous quality factors regardless of the positions of the movement, and accordingly a low PP-FQ.
- the four lubricants (apart from the reference lubricant) under consideration are additive-containing oils of the HP type, which have different viscosities:
- the viscosity of the SAL 9010 reference oil used has a viscosity of 1.2 St at 20° C.
- FIG. 5 depicts, for each of the lubricants, curves showing the change in the quality factor (FQ), for a reference amplitude of the oscillator at 280°, depending on the different positions (P) of the movement.
- FQ quality factor
- P positions
- oil HP500 (respectively 306 and 312 in the FH and CH positions), oil HP750 (respectively 301 and 305 in the FH and CH positions), oil HP1000 (respectively 291 and 299 in the FH and CH positions), and finally oil HP1300 (respectively 282 and 287 in the FH and CH positions).
- oil HP500 (respectively 306 and 312 in the FH and CH positions)
- oil HP750 (respectively 301 and 305 in the FH and CH positions)
- oil HP1000 (respectively 291 and 299 in the FH and CH positions)
- oil HP1300 (respectively 282 and 287 in the FH and CH positions).
- the quality factor values of the oils of type HP lie between 235 and 238.
- the flat hanging differences of the quality factor PP-FQ of oils of type HP, lying between 50 and 70, are lower than that of oil 9010, which tends towards 80 ( FIG. 6 ).
- the quality factor of the oscillator is less sensitive to the positions of the movement with lubricants of type HP, while being sufficiently high, in the order of 230 to 315, to permit good chronometric and/or energetic performances of the oscillator.
- the frictional torques prevailing within the pivot devices lubricated by oils of type HP are sufficiently low to obtain satisfactory quality factors and vary sufficiently little to obtain homogeneous quality factors, regardless of the positions of the movement, and accordingly a low flat hanging difference for the quality factor PP-FQ.
- the flat hanging difference of the quality factor of the oscillator depends to a very considerable degree on the viscosity of the lubricant used. Whether or not the lubricant contains additives, it is possible to cause the flat hanging difference of the quality factor of the oscillator to vary by causing the viscosity of the lubricant used to vary.
- Polyalphaolefin-based lubricant preferably means a lubricant of which the main components are polyalphaolefin components or a lubricant including more that 60% of polyalphaolefin components by weight.
- a suchlike lubricant may or may not contain additives in the form of friction modifier additives and/or antioxidant additives and/or anti-wear additives, in order to satisfy predefined performance and reliability objectives, more particularly chronometric performance and reliability objectives.
- this list is not restrictive.
- a lubricant having a viscosity of at least 5 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 10%.
- a polyalphaolefin-based lubricant having a viscosity of at least 1.8 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 7%.
- a polyalphaolefin-based lubricant having a viscosity of at least 2.2 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 8%.
- a polyalphaolefin-based lubricant having a viscosity of at least 3 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 10%.
- a polyalphaolefin-based lubricant having a viscosity of at least 5 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 15%.
- a polyalphaolefin-based lubricant having a viscosity of at least 6 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 20%.
- a polyalphaolefin-based lubricant having a viscosity of at least 1.5 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 1%.
- a polyalphaolefin-based lubricant having a viscosity of at least 1.6 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 2%.
- a polyalphaolefin-based lubricant having a viscosity of at least 1.8 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 3%.
- a polyalphaolefin-based lubricant having a viscosity of at least 2 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 4%.
- a polyalphaolefin-based lubricant having a viscosity of at least 2.2 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 5%.
- a polyalphaolefin-based lubricant having a viscosity of at least 3 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 8%.
- a polyalphaolefin-based lubricant having a viscosity of at least 5 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 15%.
- a polyalphaolefin-based lubricant having a viscosity of at least 6 St at 20° C. allows to decrease the flat hanging difference of the quality factor by at least 20%.
- a lubricant having a viscosity of less than 14 St at 20° C. allows to not decrease the quality factor by more than 20%.
- a lubricant having a viscosity of less than 5 St at 20° C. allows to not decrease the quality factor by more than 15%.
- a polyalphaolefin-based lubricant having a viscosity of less than 12 St at 20° C. allows to not decrease the quality factor by more than 10%.
- a polyalphaolefin-based lubricant having a viscosity of less than 5 St at 20° C. allows to not decrease the quality factor.
- a polyalphaolefin-based lubricant having a viscosity of less than 8 St at 20° C. allows to not decrease the quality factor by more than 5%.
- the invention may also be applied to another type of pivot device or to a pivot device adapted to pivot an element other than a balance wheel.
Abstract
Description
- 1. A method of assembly of a watch pivot device or a watch mechanism or a watch movement or a timepiece, the watch pivot device or the watch mechanism or the watch movement or the timepiece comprising a pivot and a bearing, the method comprising the following stages:
- supplying the pivot;
- supplying the bearing;
- applying, to at least one surface of the pivot and/or of the bearing, a lubricant of which the kinematic viscosity at a temperature of 20° C. is greater than 1.5 St;
- positioning the pivot in the bearing.
- 2. The method as defined in the preceding point, wherein the lubricant is a polyalphaolefin-based lubricant.
- 3. The method as defined in one of the preceding points, wherein the kinematic viscosity of the lubricant at a temperature of 20° C. is greater than 1.6 St or 1.7 St or 1.8 St or 1.9 St or 2 St or 2.2 St or 2.5 St or 3 St or 4 St or 5 St or 6 St or 7 St or 8 St or 9 St or 10 St or 11 St or 12 St or 14 St or 16 St or 18 St or 20 St or 25 St or 30 St or 35 St or 40 St and/or wherein the kinematic viscosity of the lubricant at a temperature of 20° C. is lower than 50 St or 40 St or 35 St or 30 St or 25 St or 20 St or 18 St or 16 St or 14 St or 12 St or 11 St or 10 St or 9 St or 8 St or 7 St or 6 St or 5 St.
- 4. The method as defined in one of the preceding points, wherein the pivot is a balance staff pivot of an oscillator of the balance wheel and hairspring type, more particularly an oscillator of the balance wheel and hairspring type having a frequency of oscillation greater than or equal to 3 Hz, or greater than or equal to 4 Hz, and/or wherein the bearing comprises at least one jewel, more particularly a ruby.
- 5. The method as defined in one of the preceding points, wherein the pivot is a pivot of an element of which the mass is greater than 5×10−2 g and/or of which the moment of inertia is greater than 5×10−10 kg·m2.
- 6. A watch pivot device or a watch mechanism or a watch movement or a timepiece, obtained by the implementation of a method as defined in one of the preceding points.
- 7. A watch pivot device comprising a pivot and a bearing, at least one surface of the pivot and/or of the bearing being coated with a lubricant of which the kinematic viscosity at a temperature of 20° C. is greater than 1.5 St.
- 8. The device as defined in point 6 or 7, wherein the lubricant is a polyalphaolefin-based lubricant.
- 9. The device as defined in one of points 6 to 8, wherein the kinematic viscosity of the lubricant at a temperature of 20° C. is greater than 1.6 St or 1.7 St or 1.8 St or 1.9 St or 2 St or 2.2 St or 2.5 St or 3 St or 4 St or 5 St or 6 St or 7 St or 8 St or 9 St or 10 St or 11 St or 12 St or 14 St or 16 St or 18 St or 20 St or 25 St or 30 St or 35 St or 40 St and/or wherein the kinematic viscosity of the lubricant at a temperature of 20° C. is lower than 50 St or 40 St or 35 St or 30 St or 25 St or 20 St or 18 St or 16 St or 14 St or 12 St or 11 St or 10 St or 9 St or 8 St or 7 St or 6 St or 5 St.
- 10. The device as defined in one of points 6 to 9, wherein the pivot is a balance staff pivot of an oscillator of the balance wheel and hairspring type, more particularly an oscillator of the balance wheel and hairspring type having a frequency of oscillation greater than or equal to 3 Hz, or greater than or equal to 4 Hz, and/or wherein the bearing comprises at least one jewel, more particularly a ruby.
- 11. The device as defined in one of points 6 to 10, wherein the pivot is a pivot of an element of which the mass is greater than 5×10−2 g and/or of which the moment of inertia is greater than 5×10−10 kg·m2.
- 12. A watch mechanism comprising a device as defined in one of points 6 to 11.
- 13. A watch movement comprising a device as defined in one of points 6 to 11 or a mechanism as defined in the preceding point.
- 14. A timepiece, more particularly a wristwatch, comprising a movement as defined in the preceding point or a mechanism as defined in point 12 or a device as defined in one of points 6 to 11.
-
- supplying the
pivot 1; - supplying the
bearing 2; - applying, to at least one
surface - positioning the pivot in the bearing.
- supplying the
-
- a first oil A has a viscosity of 1.3 St at 20° C.;
- a second oil B has a viscosity of 7.1 St at 20° C.;
- a third oil C has a viscosity of 12.9 St at 20° C.;
- a fourth oil D has a viscosity of 21.4 St at 20° C.;
- a fifth oil E has a viscosity of 44 St at 20° C.
-
- a sixth oil Synt-HP500 (HP500) from the manufacturer Moebius, having a viscosity of 5 St at 20° C.;
- a seventh oil Synt-HP750 (HP750) from the manufacturer Moebius, having a viscosity of 7.5 St at 20° C.;
- an eighth oil Synt-HP1000 (HP1000) from the manufacturer Moebius, having a viscosity of 10 St at 20° C.;
- a ninth oil Synt-HP1300 (HP1300) from the manufacturer Moebius, having a viscosity of 13 St at 20° C.
Claims (19)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP17183962 | 2017-07-31 | ||
EP17183962.4 | 2017-07-31 | ||
EP17183962 | 2017-07-31 |
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Publication Number | Publication Date |
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US20190033791A1 US20190033791A1 (en) | 2019-01-31 |
US11392091B2 true US11392091B2 (en) | 2022-07-19 |
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US16/047,646 Active 2040-11-03 US11392091B2 (en) | 2017-07-31 | 2018-07-27 | Watch pivot device |
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US (1) | US11392091B2 (en) |
EP (1) | EP3451078A1 (en) |
JP (1) | JP7221605B2 (en) |
CN (1) | CN109324494B (en) |
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JP2021036031A (en) * | 2019-08-21 | 2021-03-04 | シチズン時計株式会社 | Grease composition for precision instrument and watch using the same |
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JPS6048181U (en) * | 1983-09-09 | 1985-04-04 | セイコーエプソン株式会社 | Bearings for watches |
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2018
- 2018-07-27 US US16/047,646 patent/US11392091B2/en active Active
- 2018-07-30 EP EP18186364.8A patent/EP3451078A1/en active Pending
- 2018-07-30 JP JP2018142040A patent/JP7221605B2/en active Active
- 2018-07-30 CN CN201810859371.3A patent/CN109324494B/en active Active
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Also Published As
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CN109324494B (en) | 2022-03-25 |
JP7221605B2 (en) | 2023-02-14 |
JP2019060853A (en) | 2019-04-18 |
US20190033791A1 (en) | 2019-01-31 |
EP3451078A1 (en) | 2019-03-06 |
CN109324494A (en) | 2019-02-12 |
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